Product category:
Power Supply ICs and Controllers
News Release from: Intersil | Subject: ISL6310 and ISL6308
Edited by the Electronicstalk Editorial
Team on 24 August 2005
PWM controllers integrate more onboard
New two- and three-phase PWM controllers feature high-current, integrated MOSFET drivers and industry-leading system accuracy.
Intersil has introduced two- and three-phase PWM (pulsewidth modulation) controllers with high-current, integrated MOSFET drivers and industry-leading system accuracy By integrating the MOSFET driver with the PWM controller, the number of external parts is reduced, providing the customer with cost and space savings in their power management designs
This article was originally published on Electronicstalk on 8 Oct 2008 at 8.00am (UK)
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The ISL6310 and ISL6308 also feature differential remote voltage sensing for high system accuracy, and a 2bit DAC (digital-to-analogue convertor) that allows the designer to program the output voltage without the use of external resistors.
These features plus prebiased load startup, current sink/source capability and the devices' small QFN (quad flat no leads) package mean that they are optimised for server and embedded system peripheral voltage regulation applications.
The devices offer a completely programmable voltage droop pin for applications such as DDR (double datarate) memory and chipset cores that don't require the power convertor voltage droop or prepositioning often found in CPUs.
Further reading
Intersil introduces stereo multiplexer
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Intersil has expanded its VR11.1-compliant PWM controller range with four-phase and six-phase PWM controllers that feature high light load efficiency and fast transient performance.
Intersil launches multiplexer for video switching
Intersil Corporation has announced the ISL59450 Multiformat Video Multiplexer with Integrated Sync Separator, a device designed for the variety of video signals and formats used today.
Designers have the option of adjusting the droop function in order to maintain output voltage regulation through severe transient loads, with fewer output capacitors.
Other applications include high-current, low-voltage point-of-load convertors and other general-purpose applications.
The output voltage of the ISL6310 and ISL6308 can be programmed using an on-chip DAC or an external precision reference, such as the ISL60002 series.
A 2bit code programs the DAC reference to one of four possible values (0.6, 0.9, 12 or 1.5V).
A unity-gain, differential amplifier is provided for remote voltage sensing, compensating for any potential difference between remote and local grounds.
The output voltage can also be offset through the use of a single external resistor.
The integrated MOSFET gate driver bias voltage of the ISL6310 and ISL6308 is programmable from 5 to 12V, allowing the designer to achieve the optimum trade-off between the switching and conduction losses associated with the upper and lower MOSFETs.
The devices also have the ability to power a precharged output without causing any output voltage disturbances, and can source and sink load current.
Intersil's ISL6310 and ISL6308 feature an optional droop function that can be disabled for applications that have less stringent output voltage variation requirements or experience less severe step loads.
A unique feature of these devices is the combined use of both DC resistance and on-resistance current sensing.
Using both methods of current sampling leverages the best advantages of each technique.
Protection features of the ISL6310 and ISL6308 include overvoltage and overcurrent protection.
Both parts have a pre-power-on reset overvoltage protection feature.
Prior to the PVCC (power voltage pin for integrated drivers) and the VCC (voltage power pin for IC bias) exceeding their POR levels, the ISL6310 and ISL6308 are designed to protect the load from any overvoltage events that may occur.
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